IRON-BASED SOFT MAGNETIC POWDER FOR DUST CORE, METHOD FOR PRODUCING THE SAME AND DUST CORE

Title:

IRON-BASED SOFT MAGNETIC POWDER FOR DUST CORE, METHOD FOR PRODUCING THE SAME AND DUST CORE

Document Type and Number:

WIPO Patent Application WO/2008/032503

Kind Code:

A1

Abstract:

Disclosed is an iron powder for dust core having excellent mechanical strength, wherein effective insulation is achieved between iron powder particles even when the amount of an insulating material is reduced for realizing high-density molding. This iron powder for dust core is also excellent in thermal stability, so that electrical insulation is maintained after a heat treatment at high temperature. Specifically disclosed is an iron-based soft magnetic powder for dust core, which is characterized in that a phosphoric acid type chemical conversion coating film and a silicone resin coating film are formed on the surface of an iron-based soft magnetic powder in this order and the phosphoric acid type chemical conversion coating film contains one or more elements selected from the group consisting of Co, Na, S, Si and W.

Inventors:

MITANI HIROYUKI
AKAGI NOBUAKI
HOUJOU HIROFUMI
ISHIHARA CHIO
IWAKIRI MAKOTO
YAMADA SOHEI
MOCHIMIZO YASUKUNI

Application Number:

PCT/JP2007/065177

Publication Date:

March 20, 2008

Filing Date:

August 02, 2007

Export Citation:

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Assignee:

KOBE STEEL LTD (JP)
MITANI HIROYUKI
AKAGI NOBUAKI
HOUJOU HIROFUMI
ISHIHARA CHIO
IWAKIRI MAKOTO
YAMADA SOHEI
MOCHIMIZO YASUKUNI

International Classes:

B22F1/06; B22F1/102; B22F1/145; B22F1/16; H01F1/26

Foreign References:

JP2006202956A	2006-08-03
JP2003303711A	2003-10-24
JP2002083709A	2002-03-22
JP2004143554A	2004-05-20
JP2003303711A	2003-10-24
JP2710152B2	1998-02-10
JP2006245918A	2006-09-14

Other References: